So currently League of Legends (a free to play MOBA [Multiplayer Online Battle Arena] game), is providing a special sale, where every purchase of the champion Akali, or of her Nurse Uniform costume will be given to Red Cross for supporting Tsunami recovery efforts in Japan. This is only up until March 27th.
I'm posting this here because I both support LoL for being an awesome game, and Riot for opening this opportunity for gamers to help out another society. So here is a link to the article about it.
And here is a sign up link for anyone who wants to try out League of Legends (I get 'credit' for the sign up which eventually adds up to tangible rewards for me).